How did you know?! I did look at the conditions for good end before playing the game...
Well, that bad end gave me new costume, 1 silver trophy, 1 bronze trophy and a bloody cutscene + I feel like a badass after I alone as Ludger kicked ass of 8 powerful enemies attacking at me 4 at a time... Although I lost about an hour retrying times and times again... I also finally understood what last bosses feel when they fight alone against the party of op characters that gang up on them... And the game was kind enough to save and let me continue from before the choice that made me go for bad end with all the bonuses I got from it... So, all things said, I'm kinda glad I stumbled on this Bad End ;p